Lover of ideas

Help! DynDNS has become prohibitively expensive!

They want to charge me $40/yr per domain for secondary DNS! $40/yr! This is completely ridiculous. With the volume of lookups I get, I could probably host all the domains on my own server on a DSL line if I wanted.

Is anybody out there willing to provide secondary DNS for a few domains for me? I'm willing to cough up the equivalent of $10/yr in bitcoins for the service if you really want.